/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Polygroups/PolygroupSet.h
PolygroupAttribute this PolygroupSet references, or null if no PolygroupAttribute is in use
const [FDynamicMeshPolygroupAttribute](API\Runtime\GeometryCore\DynamicMesh\FDynamicMeshPolygroupAttribute) * GetPolygroup()